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Commit abb78f87 authored by Al Viro's avatar Al Viro
Browse files

new helper: iov_iter_kvec() 



initialization of kvec-backed iov_iter

Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent a604ec7e

include/linux/uio.h

+2 −0
Original line number Diff line number Diff line
@@ -87,6 +87,8 @@ size_t iov_iter_zero(size_t bytes, struct iov_iter *); 
unsigned long iov_iter_alignment(const struct iov_iter *i);

void iov_iter_init(struct iov_iter *i, int direction, const struct iovec *iov,

			unsigned long nr_segs, size_t count);

void iov_iter_kvec(struct iov_iter *i, int direction, const struct kvec *iov,

			unsigned long nr_segs, size_t count);

ssize_t iov_iter_get_pages(struct iov_iter *i, struct page **pages,

			size_t maxsize, unsigned maxpages, size_t *start);

ssize_t iov_iter_get_pages_alloc(struct iov_iter *i, struct page ***pages,

mm/iov_iter.c

+13 −0
Original line number Diff line number Diff line
@@ -479,6 +479,19 @@ size_t iov_iter_single_seg_count(const struct iov_iter *i) 
}

EXPORT_SYMBOL(iov_iter_single_seg_count);



void iov_iter_kvec(struct iov_iter *i, int direction,

			const struct kvec *iov, unsigned long nr_segs,

			size_t count)

{

	BUG_ON(!(direction & ITER_KVEC));

	i->type = direction;

	i->kvec = (struct kvec *)iov;

	i->nr_segs = nr_segs;

	i->iov_offset = 0;

	i->count = count;

}

EXPORT_SYMBOL(iov_iter_kvec);



unsigned long iov_iter_alignment(const struct iov_iter *i)

{

	unsigned long res = 0;